CODEWITHSUNDEEP
lua
Джонатан Блоу
Джонатан Блоу

Reputation: 123

Why stdin returns error when displaying text?

I am trying to run a simple program, but for some reason an error comes out.

I have version 5.3.5 with https://sourceforge.net/projects/luabinaries/files/. Installed on Windows version 10.0.16299.1087. The launch was made from lua53.exe command main.lua. enter image description here

print('Hello, World!')

Error Traceback:

stdin:1: attempt to index a nil value (global 'main')
stack traceback:
        stdin:1: in main chunk
        [C]: in ?

Upvotes: 1

Views: 424

Answers (1)

Curtis Fenner
Curtis Fenner

Reputation: 1403

To run a .lua file from the command line, run

lua53 myfile.lua

Simply invoking

lua53

will launch a Lua REPL (ie, you can write statements that are evaluated not in the context of any file).

However, from the REPL you can use the dofile function to execute the contents of a file:

dofile("myfile.lua")

What you were trying to do, just writing main.lua inside the REPL, was attempting to use the filename as though it were a Lua script. Since main was not previously defined, you got that error.

Upvotes: 1

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